“Can’t wait to show you one of my FAVORITE things EVER at the top of the hour… Stay ????,” Katy tweeted to her fans before the image was debuted.

Katy just became an investor for Core Hydration water.

“Hydration is key for me since I’m always on the go- whether it’s on tour or working out,” Katy said in a statement. “Not only does Core come in a beautiful package and taste great, it’s pH balanced to work in harmony with my body. It’s just natural for me to want to be a part of something that makes me feel good.”